ULP Microcontrollers are available in compact packages.

Helping developers conserve board space, MSP430™ ultra-low power (ULP) MCUs include FRAM-based MSP430FR5738 and Flash-based MSP430F51x2

[source: http://news.thomasnet.com/fullstory/ULP-Microcontrollers-are-available-in-compact-packages-20025180]